Speedometer ratio checker

Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Volume – flow or rate

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D02813114

REFERENCES:
patent: D222909 (1972-02-01), Stehl
patent: D254297 (1980-02-01), Staiert et al.
patent: 670432 (1901-03-01), Powers
patent: 3435657 (1969-04-01), Weissman
Electric Tachometer Model S120, 7/71, front cover, bottom left.

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